A singular gall or abnormal growth on a plant caused by mite feeding or infestation.
From Latin 'acarus' (mite) plus 'cecidium' (singular gall), referring to individual plant deformities induced by mites.
An acarocecidium on a leaf is actually a plant's defensive response gone wrong—instead of stopping the mite, the plant triggers growth that feeds the mite, showing how evolutionary arms races sometimes backfire.
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